The correct options are
A The zamindars found that they could profit from as long as they had land to rent and did not invest in improving the land.
C The zamindari system saw instability in the villages, which hurt the revenue and cultivation much needed by the company.
The zamindars observed profits as long as they owned land to rent and did not invest in improving lands which of one of the objectives of the Permanent Settlement. The system also saw instability in the villages, which led to instability in the cultivation of cash crops.